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No DRL or low beam headlights

Hi Guys I have a 1997 GMC K2500 with an 8 foot Western unimount and I keep having issues with the DRL's not working and when I turn on the Headlights I do not have low beam but if I turn on High beam they work. Any ideas what would cause this? This is one of those issues where they do not work today but might work fine day after tomorrow! New sealed beam headlights and checked them by hooking factory harness back up worked fine Hi and Low. Tried another relay on the low beams and still nothing. Any Ideas greatly appreciated thanks

On my 94 gmc the high beam switch was faulty and caused the low beams not to work but if you hit the high beam switch then they would come on because the low beams go through the high beam switch no matter if its on or not . hope that makes sense .

On my 94 gmc the high beam switch was faulty and caused the low beams not to work but if you hit the high beam switch then they would come on because the low beams go through the high beam switch no matter if its on or not . hope that makes sense .

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Yeah I was wondering if that could be the cause of it looks to be origanal switch so I will replace tomorrow and see I hope it is that simple. lol

I am not worried about the DRL not working with them out and the low beams out was worried that they were tied into a bigger problem Thank you for the replys I will let you know after I replace the Headlight switch if it was the problem. Thnx again!

Well fellas I ordered some new Plow harness relays cause I am not real sure how to test them! Not bad having extra ones anyway I guess I am gonna tinker with it a little today just to try and rule some things out.

Yeah I ordered them already I did go out and clean up some connecters but before I did that I plugged into my plow and nothing was working except High beams there as well so I unhooked the plow and cleaned some receptacles and now everything is working as it should. Unbelieveable I wish I would have checked them as soon as I unhooked the plow to determine if it was just a relay sticking if that is possible or not or if it was dirty receptacles. I really appreciate your input that you have given me and hope you have a great day.